Initial import of libucore

src/ucore_timers.h

@@ -0,0 +1,63 @@
+#ifndef UCORE_TIMERS_H_
+#define UCORE_TIMERS_H_
+
+#include <stddef.h>
+#include <sys/queue.h>
+#include <sys/time.h>
+#include "ucore_rbtree.h"
+
+
+struct UCTimer;
+struct UCTimers;
+
+//timer states
+enum {
+    //not running
+    UC_TIMER_INACTIVE   = 0,
+    //running
+    UC_TIMER_ACTIVE     = 1,
+    //running and pending to be fired in this run of uc_timers_run
+    UC_TIMER_PENDING    = 2
+};
+
+typedef void (*uc_timer_cb)(struct UCTimers *timers, struct UCTimer *timer);
+struct UCTimer {
+    //internal members 
+    RBNode rb_node; //the RBNode will hold a data pointer to the
+                    //the UCTimer it's a member of. We might get rid of that member, and use CONTAINER_OF
+                    //to find the UCTimer from a RBNode
+    //
+    //absolute time when the timer should be fired
+    struct timeval timeout;
+    size_t seq; //needed to keep timeout unique
+                //as the rbtree can only handle unique values
+    unsigned char state;
+    TAILQ_ENTRY(UCTimer) ready_entry; //entry in ready_list in UCTimers
+
+    //callback function
+    uc_timer_cb callback;
+
+    //user data for the callback
+    void *cookie_ptr;
+    int cookie_int;
+    int cookie_int2;
+};
+
+
+struct UCTimers {
+    RBTree timers;
+    size_t seq; //used to generate unique timers
+    TAILQ_HEAD(, UCTimer) ready_list; //pending timers to be fired while inside uc_timers_run
+};
+
+
+void uc_timer_remove(struct UCTimers *timers, struct UCTimer *timer);
+void uc_timers_init(struct UCTimers *t);
+void uc_timer_add(struct UCTimers *timers, struct UCTimer *timer, int sec, int usec);
+void uc_timer_remove(struct UCTimers *timers, struct UCTimer *timer);
+int uc_timers_first(const struct UCTimers *timers, struct timeval *first);
+size_t uc_timer_count(const struct UCTimers *timers);
+int uc_timer_running(const struct UCTimer *timer);
+int uc_timers_run(struct UCTimers *timers, const struct timeval *now);
+
+#endif